Conjugated tetraenes are important key substructures in electronic materials, natural products and pharmaceutical molecules. However, they are difficult to synthesize. They are conventionally prepared by repetitions of the stoichiometric reactions using phosphorus reagents and subsequent reduction and partial oxidation. For making one C=C double bond, one needs to conduct 3 step reactions by this procedure. Each process produces wastes of phosphorus oxides and metal compounds such as lithium, aluminum and manganese. Removal of organic solvents and purification processes are also required. An alternative catalytic approach is the cross-coupling reaction catalyzed by a Pd complex but this method needs to prepare an activated alkenyl or dienyl metal species in advance.